New Methods of Alkalimetry, and of Determining the Commercial Value of Acids and Manganese, by C.r. Fresenius and H. Will [A Tr.] Ed. by J.l. Bullock - Softcover

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1843. Excerpt: ... SECTION XXXV. Method of expressing the results. The commercial value of the various kinds of manganese may be expressed and marked, either looking to their respective amount of available oxygen alone, or having regard, at the same time, to the amount of acid required for the decomposition of the manganese under examination. The clearest and most simple way in the former case, is to calculate the amount of available oxygen, in peroxide of manganese, and then to express the commercial value of manganese by its percentage amount of peroxide. It might be objected to this method, that manganese may contain certain ores (Psilomelane or Manganite) which, without being peroxides, yet contain available oxygen. This objection is, however, only apparent, since the amount of peroxide is always calculated solely upon the amount of available oxygen found, and thus for a larger proportion of psilomelane, &c, the corresponding amount of peroxide only is expressed. This method of representing the results perfectly agrees with that of Gay-Lussac, i.e. manganese of 100 per cent. of peroxide is = manganese of 100 degrees of chlorine. But if the expenditure of acid is to be taken into account, we deem the method of representing the results by fractions the most simple. The numerator indicates the per-centage amount of peroxide in the manganese, the denominator the amount of hydrochloric acid required for the complete decomposition of 100 parts of the manganese: this denominator is expressed in two numbers, the one shewing the amount of acid really efficient in the production of chlorine, whilst the other indicates the amount wasted. Thus pure pyrolusite would be marked as follows:--Manganese of f-0 Pure psilomelane, Manganese of A mixture of nine parts of peroxide of mangane...

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